Hydrogen-Ion Concentration

Publication Title: 
The Journal of Physical Chemistry. B

While recent research on interfacial water has focused mainly on the few interfacial layers adjacent to the solid boundary, century-old studies have extensively shown that macroscopic domains of liquids near interfaces acquire features different from the bulk. Interest in these long-range effects has been rekindled by recent observations showing that colloidal and molecular solutes are excluded from extensive regions next to many hydrophilic surfaces [Zheng and Pollack Phys. Rev. E 2003, 68, 031408].

Author(s): 
Chai, Binghua
Yoo, Hyok
Pollack, Gerald H.
Publication Title: 
American Journal of Rhinology & Allergy

BACKGROUND: Proton (H+) secretion and the HVCN1 H+ channel are part of the innate host defense mechanism of the airways. The objective of this study was to determine H+ secretion in asthmatic and nonasthmatic patients with chronic rhinosinusitis (CRS) in freshly excised human sinonasal tissue. METHODS: Nasal or sinus mucosa from subjects with three different conditions (normal, CRS, and CRS with asthma) was harvested during sinus surgery. The equilibrium pH and the rate of H+ secretion were measured in an Ussing chamber using the pH-stat titration technique.

Author(s): 
Cho, Do-Yeon
Hajighasemi, Mohammad
Hwang, Peter H.
Illek, Beate
Fischer, Horst
Publication Title: 
PloS One

BACKGROUND: Recent studies have demonstrated that several mineral products sold for medicinal purposes demonstrate antimicrobial activity, but little is known about the physicochemical properties involved in antibacterial activity. METHODOLOGY/PRINCIPAL FINDINGS: Using in vitro mineral suspension testing, we have identified two natural mineral mixtures, arbitrarily designated BY07 and CB07, with antibacterial activity against a broad-spectrum of bacterial pathogens.

Author(s): 
Cunningham, Tanya M.
Koehl, Jennifer L.
Summers, Jack S.
Haydel, Shelley E.
Publication Title: 
Caries Research

Cranberry crude extracts, in various vehicles, have shown inhibitory effects on the formation of oral biofilms in vitro. The presence of proanthocyanidins (PAC) in cranberry extracts has been linked to biological activities against specific virulence attributes of Streptococcus mutans, e.g. the inhibition of glucosyltransferase (Gtf) activity. The aim of the present study was to determine the influence of a highly purified and chemically defined cranberry PAC fraction on S.

Author(s): 
Koo, H.
Duarte, S.
Murata, R. M.
Scott-Anne, K.
Gregoire, S.
Watson, G. E.
Singh, A. P.
Vorsa, N.
Publication Title: 
Environmental Science & Technology

Natural clays have been used in ancient and modern medicine, but the mechanism(s) that make certain clays lethal against bacterial pathogens has not been identified. We have compared the depositional environments, mineralogies, and chemistries of clays that exhibit antibacterial effects on a broad spectrum of human pathogens including antibiotic resistant strains. Natural antibacterial clays contain nanoscale (<200 nm), illite-smectite and reduced iron phases.

Author(s): 
Williams, Lynda B.
Metge, David W.
Eberl, Dennis D.
Harvey, Ronald W.
Turner, Amanda G.
Prapaipong, Panjai
Poret-Peterson, Amisha T.
Publication Title: 
BMC cancer

BACKGROUND: The glycolytic nature of malignant tumors contributes to high levels of extracellular acidity in the tumor microenvironment. Tumor acidity is a driving force in invasion and metastases. Recently, it has been shown that buffering of extracellular acidity through systemic administration of oral bicarbonate can inhibit the spread of metastases in a mouse model for metastatic breast cancer. While these findings are compelling, recent assessments into the use of oral bicarbonate as a cancer intervention reveal limitations.

Author(s): 
Robey, Ian F.
Martin, Natasha K.
Publication Title: 
Microbial Cell Factories

BACKGROUND: Lactobacillus reuteri harbors the genes responsible for glycerol utilization and vitamin B12 synthesis within a genetic island phylogenetically related to gamma-Proteobacteria. Within this island, resides a gene (lreu_1750) that based on its genomic context has been suggested to encode the regulatory protein PocR and presumably control the expression of the neighboring loci. However, this functional assignment is not fully supported by sequence homology, and hitherto, completely lacks experimental confirmation.

Author(s): 
Santos, Filipe
Spinler, Jennifer K.
Saulnier, Delphine M. A.
Molenaar, Douwe
Teusink, Bas
de Vos, Willem M.
Versalovic, James
Hugenholtz, Jeroen
Publication Title: 
The Science of the Total Environment

Arsenic and lead have been found in a number of traditional Ayurvedic medicines, and the practice of Rasa Shastra (combining herbs with metals, minerals and gems), or plant ingredients that contain these elements, may be possible sources. To obtain an estimate of arsenic and lead solubility in the human gastrointestinal tract, bioaccessibility of the two elements was measured in 42 medicines, using a physiologically-based extraction test.

Author(s): 
Koch, Iris
Moriarty, Maeve
House, Kim
Sui, Jie
Cullen, William R.
Saper, Robert B.
Reimer, Kenneth J.
Publication Title: 
British Journal of Cancer

BACKGROUND: Clinical positron emission tomography imaging has demonstrated the vast majority of human cancers exhibit significantly increased glucose metabolism when compared with adjacent normal tissue, resulting in an acidic tumour microenvironment. Recent studies demonstrated reducing this acidity through systemic buffers significantly inhibits development and growth of metastases in mouse xenografts.

Author(s): 
Martin, N. K.
Robey, I. F.
Gaffney, E. A.
Gillies, R. J.
Gatenby, R. A.
Maini, P. K.
Publication Title: 
Journal of Agricultural and Food Chemistry

Defatted soybean flour (DSF) can efficiently sorb, concentrate, and stabilize polyphenols, but not sugars, from Concord grape juice, to yield grape polyphenol-enriched DSF. Sorption of grape polyphenols to DSF particles was dependent on the ratio of DSF and grape juice concentrate used, but not time of mixing or pH. Depending on ratios of starting materials, 1 g of grape polyphenol-enriched DSF contained 1.6-10.4 mg of anthocyanins, 7.5-93.1 mg of proanthocyanidins, and 20.5-144.5 mg of total polyphenols.

Author(s): 
Roopchand, Diana E.
Kuhn, Peter
Poulev, Alexander
Oren, Andrew
Lila, Mary Ann
Fridlender, Bertold
Raskin, Ilya

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